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HCIL-91-12, CS-TR-2764, CAR-TR-585
In cases when only limited alphanumeric data must be entered, or when
layout, labeling, or size may be changed, traditional keyboards may not be optimal. A series of experiments has demonstrated the usability of touchscreen keyboards. We give a summary
of the existing data concerning the usability of touchscreen keyboards including typing rates for experts and novices on keyboards of various sizes. We also report on a recent study done with representative users. Results indicate that typing rates inc
rease rapidly reaching peak performance after only 25 minutes of use. Practical suggestions for the design of such a keyboard are also presented.